Two people are dead and nine others were injured Wednesday morning after an explosion believed to be caused by a gas leak leveled part of a Minnesota school building, emergency authorities said.

According to the Minneapolis fire chief, the second body was found in the rubble.

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Two floors collapsed over a subbasement in Minneapolis' Minnehaha Academy, a pre-K to 12th grade Christian school, Minneapolis Fire Chief John Fruetel said in an afternoon briefing.

"We still consider it a rescue at this point," Fruetel said, adding that crews did not know specifically where the missing person was when the building collapsed, but they have a "general area."

"It's a very precarious situation. It's very unstable."

All of the victims are adults, with three in critical condition, four in serious condition and two suffering "very minor trauma," according to the Star Tribune.

"It could have been a lot worse," Dr. Jim Miner, Hennepin County Medical Center's chief of emergency services said during a media briefing. "We were relieved, we were prepared for a lot more injuries. It was a terrible tragedy."

The Star Tribune said there were female students on campus for summer cross-country practice, as well as school basketball and soccer players. One of the runners said the team had just left the building and described the scene.

"All the windows just burst out," she said. "There was a huge explosion that was so loud that it just shook your insides."

Manny Munson-Regala via CNN

Fire crews were searching for possible victims and extinguishing a blaze after a building collapsed at Minnehaha Academy in Minneapolis on August 2, 2017, officials said.